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    Subject[PATCH 3.19 147/177] IB/iser: Fix wrong calculation of protection buffer length
    Date
    3.19-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Sagi Grimberg <sagig@mellanox.com>

    commit a065fe6aa25ba6ba93c02dc13486131bb3c64d5f upstream.

    This length miss-calculation may cause a silent data corruption
    in the DIX case and cause the device to reference unmapped area.

    Fixes: d77e65350f2d ('libiscsi, iser: Adjust data_length to include protection information')
    Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
    Signed-off-by: Doug Ledford <dledford@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/infiniband/ulp/iser/iser_initiator.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/infiniband/ulp/iser/iser_initiator.c
    +++ b/drivers/infiniband/ulp/iser/iser_initiator.c
    @@ -409,8 +409,8 @@ int iser_send_command(struct iscsi_conn
    if (scsi_prot_sg_count(sc)) {
    prot_buf->buf = scsi_prot_sglist(sc);
    prot_buf->size = scsi_prot_sg_count(sc);
    - prot_buf->data_len = data_buf->data_len >>
    - ilog2(sc->device->sector_size) * 8;
    + prot_buf->data_len = (data_buf->data_len >>
    + ilog2(sc->device->sector_size)) * 8;
    }

    if (hdr->flags & ISCSI_FLAG_CMD_READ) {



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